퇴직 KITAS 또는 퇴직 KITAP는 제가 출국하면 만료되나요?

No. The 퇴직 KITAS 그리고 은퇴 KITAP are multiple-entry permits, meaning you can enter and leave Indonesia as often as you want during the validity period.

Your KITAS/KITAP will not expire automatically just because you travel abroad.
It only expires on its official end date, unless cancelled intentionally (e.g., through an EPO).